There’s many different types and formats for Private Keys.
For example, a single address private key(WIF) should look like:
- Hierarchical Deterministic (HD) Wallet Keys
Wallet software may use a BIP 32 seed to generate many private keys and corresponding public keys from a single secret value. This is called a hierarchical deterministic wallet, or HD wallet for short. The seed value, or master extended key, consists of a 256-bit private key and a 256-bit chain code, for 512 bits in total. The seed value should not be confused with the private keys used directly to sign Bitcoin transactions.
- Mnemonic phrase
A mnemonic phrase, mnemonic recovery phrase or mnemonic seed is a list of words which store all the information needed to recover a Bitcoin wallet. Wallet software will typically generate a mnemonic backup phrase and instruct the user to write it down on paper. If the user’s computer breaks or their hard drive becomes corrupted, they can download the same wallet software again and use the paper backup to get their bitcoins back.
Base58 Wallet Import format
When importing or sweeping ECDSA private keys, a shorter format known
as wallet import format is often used, which offers a few advantages.
The wallet import format is shorter, and includes built-in error
checking codes so that typos can be automatically detected and/or
corrected (which is impossible in hex format) and type bits indicating
how it is intended to be used. Wallet import format is the most common
way to represent private keys in Bitcoin. For private keys associated
with uncompressed public keys, they are 51 characters and always start
with the number 5 on mainnet (9 on testnet). Private keys associated
with compressed public keys are 52 characters and start with a capital
L or K on mainnet (c on testnet).
- Mini private key format Some applications use the mini private key format.
Not every private key or Bitcoin address has a corresponding
mini private key – they have to be generated a certain way in order to
ensure a mini private key exists for an address. The mini private key
is used for applications where space is critical, such as in QR codes
and in physical bitcoins. The above example has a mini key, which is:
You should know which private key they’re asking for and you are sending the correct one.
Importing private address key (WIF) command should be like that:
importprivkey yourPrivateKeyInWalletImportFormat "TheLabelThatIWant"